Rpod 177 rear window leak

I tried the Eternabond, but it did not adhere, though I've used it with good luck in other applications.  Surface was cleaned prior to application.  May be my fault.  Had to buy a new spoiler (since original was too warped to reuse), which is the same flimsy stuff as the original. But IMHO a straight spoiler can be fully sealed.  First, use stainless steel screws (there is nothing but the outer seating to bite into).  Old screw holes should be filled and sealed, for the new spoiler was slightly differen in hole spacing.  Take foam off of new spoiler and clean and roughen the surface beneath it.  Run a heavy bead of sealer (I used 3M 4200, which is a sealer and adhesive). to seat the spoiler in.  Be sure to fully seal wiring hole (mine was not sealed at all).  Then, once reinstalled, seal edge with Dicor non sag sealant.  Be sure to seal tops of screws. Only an opinion, but I would go the Dicor route before the tape. My problem with the tape was the warped and very uneven surface of the spoiler.  BTW, FR is well aware of this issue and how a redesign can fix it.  Perhaps on the newer ones it has addressed the problem.     

+1 to both cleaning the old sealant. I used mineral spirits to remove the old Dicor sealant and then used denatured alcohol to do a final cleaning before putting down new sealant. That was before I knew about Eternabond tape. If I were doing it again, I would probably go that route.

I think it was a combination. The heat softened the plastic and the foam pushed it up.

More reason to suspect spoiler. Those leaks can be really tricky. When my spoiler leaked the only indication I got was floor of trailer on the bottom, at very rear of trailer was wet. I was installing back-up lights when I found floor soaked.